Noob questions about SJ Surface Radar

[Havan_IronOak]

I got my first SJ radar equipped boat and I want to know all about my new toy...


I turned this on after I left the vicinity of Pearl (I didn't realize that it defaulted to off until I got my first sighting contact the "old fashioned" hydrophone way.)


I switched the set on by manually going to the set and flipping the switch. Actually, I tried the Ctrl T hotkey and didn't see anything in the message window so I tried it again. When that failed I went to the set and flipped the switch.

I now understand that the Ctrl T hotkey actually worked the first time but that no message gets displayed. Trying it again actually turned off the unit.

I see that there are three range settings... is there a downside for selecting anything other than max?

I also see that there are two modes, Sweep & Focus can someone either tell me or point me to an explanation of what the differences are?

Finally, some questions on how this type of Radar is modeled in the game...
1) Will always having this on really attract a lotta flies? It doesn't seem like it should because the Japanese were pretty oblivious to Radar but I'm guessing that in-game that's not really true.
2) Should I turn OFF my SD radar now that I've got the SJ set? I understand that it picked up airborne contacts as well.